19893930 has 64 divisors (see below), whose sum is σ = 55496448. Its totient is φ = 4469760.

The previous prime is 19893911. The next prime is 19893943. The reversal of 19893930 is 3939891.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12034 + ... + 13586.

It is an arithmetic number, because the mean of its divisors is an integer number (867132).

Almost surely, 2^19893930 is an apocalyptic number.

19893930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19893930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27748224).

19893930 is an abundant number, since it is smaller than the sum of its proper divisors (35602518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19893930 is a wasteful number, since it uses less digits than its factorization.

19893930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 19893930 is about 4460.2612031136. The cubic root of 19893930 is about 270.9610470376.

The spelling of 19893930 in words is "nineteen million, eight hundred ninety-three thousand, nine hundred thirty".